Relative Efficiency of Prilled Urea, Urea Super Granules, Sulphur Coated Urea and Nitrification Inhibitor N-Serve Blended Urea for Direct Seeded Rice

1987 ◽  
Vol 159 (5) ◽  
pp. 302-307 ◽  
Author(s):  
J. Thomas ◽  
R. Prasad
Keyword(s):  
Relative Efficiency ◽  
Nitrification Inhibitor ◽  
Prilled Urea ◽  
Coated Urea ◽  
Direct Seeded

Relative efficiency of prilled urea, urea supergranules (USG) and USG coated with neem cake or DCD for direct-seeded rice

1986 ◽  
Vol 106 (1) ◽  
pp. 185-190 ◽  
Author(s):  
K. Sudhakara ◽  
R. Prasad
Keyword(s):  
Nitrogen Uptake ◽  
Relative Efficiency ◽  
Agricultural Research ◽  
Indian Agricultural Research Institute ◽  
New Delhi ◽  
Urea Supergranules ◽  
Neem Cake ◽  
Prilled Urea ◽  
Rough Rice ◽  
Direct Seeded

SUMMARYA field experiment was made during the rainy season of 1982 and 1983 at the Indian Agricultural Research Institute, New Delhi to study the relative efficiency of prilled urea, urea supergranules (USG) and USG coated with neem cake and DCD. Prilledurea was applied at 60, 120 and 180 kg N/ha, while the other sources of N were applied only at 120 kg N/ha. Nitrogen was added to rice in a single application 20 days after sowing (20 DAS) or in two applications, half 20 DAS and the rest at panicle initiation. Response of rice to prilled urea was linear up to 180 kg N/ha, the highest dose in the present study. Two applications produced more rough rice and straw and resulted in higher nitrogen uptake and apparent recovery than a singleapplication. Neem-cakecoated USG was superior to prilled urea in respect of panicle characters, rough rice and straw yield, nitrogen uptake and apparent nitrogen recovery. Coating USG with DCD also showed some advantage. Uncoated USG was only slightly better than prilled urea.

Evaluation of Polymer-Coated Urea for Direct-Seeded, Delayed-Flood Rice Production

2009 ◽  
Vol 73 (2) ◽  
pp. 375-383 ◽  
Author(s):  
B.R. Golden ◽  
N.A. Slaton ◽  
R.J. Norman ◽  
C.E. Wilson ◽  
R.E. DeLong
Keyword(s):  
Rice Production ◽  
Coated Urea ◽  
Direct Seeded ◽  
Polymer Coated Urea

The nitrification inhibitor DMPP applied to subtropical rice has an inconsistent effect on nitrous oxide emissions

Soil Research ◽  
2017 ◽  
Vol 55 (6) ◽  
pp. 547 ◽  
Author(s):  
Terry J. Rose ◽  
Stephen G. Morris ◽  
Peter Quin ◽  
Lee J. Kearney ◽  
Stephen Kimber ◽  
...  
Keyword(s):  
Nitrous Oxide ◽  
Nitrification Inhibitor ◽  
Nitrous Oxide Emissions ◽  
N2o Emissions ◽  
Aerobic Rice ◽  
Growing Period ◽  
Tropical Environments ◽  
Peak Flux ◽  
Coated Urea ◽  
Fertiliser Application

Although there is growing evidence that the nitrification inhibitor 3,4-dimethylpyrazole phosphate (DMPP) can lower soil nitrous oxide (N2O) emissions in temperate environments, there is little evidence of its efficacy in subtropical or tropical environments where temperatures and rainfall intensities are typically higher. We investigated N2O emissions in field-grown aerobic rice in adjacent fields in the 2013–14 and 2014–15 seasons in a subtropical environment. Crops were topdressed with 80 kg nitrogen (N) ha–1 before rainfall, as either urea, urea + DMPP (at 1.6 kg DMPP t–1 urea: ‘urea-DMPP’) or a blend of 50% urea and 50% urea-DMPP in the 2013–14 season, and urea, urea-DMPP or polymer (3 month)-coated urea (PCU) in the 2014–15 season. DMPP-urea significantly (P < 0.05) lowered soil N2O emissions in the 2013–14 season during the peak flux period after N fertiliser application, but had no effect in 2014–15. The mean cumulative N2O emissions over the entire growing period were 190 g N2O-N ha–1 in 2013–14 and 413 g N2O-N ha–1 in 2014–15, with no significant effect of DMPP or PCU. Our results demonstrate that DMPP can lower N2O emissions in subtropical, aerobic rice during peak flux events following N fertiliser application in some seasons, but inherent variability in climate and soil N2O emissions limited the ability to detect significant differences in cumulative N2O flux over the seasonal assessment. A greater understanding of how environmental and soil factors impact the efficacy of DMPP in the subtropics is needed to formulate appropriate guidelines for its use commercially.

scholarly journals Innovative Controlled-Release Polyurethane-Coated Urea Could Reduce N Leaching in Tomato Crop in Comparison to Conventional and Stabilized Fertilizers

Agronomy ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 1827
Author(s):  
Luca Incrocci ◽  
Rita Maggini ◽  
Tommaso Cei ◽  
Giulia Carmassi ◽  
Luca Botrini ◽  
...  
Keyword(s):  
Controlled Release ◽  
Crop Yields ◽  
Nutrient Use Efficiency ◽  
Nitrification Inhibitor ◽  
Fruit Production ◽  
N Leaching ◽  
Vegetable Production ◽  
Tomato Crop ◽  
Total N ◽  
Coated Urea

Large amounts of fertilizers are being used in agriculture to sustain growing demands for food, especially in vegetable production systems. Soluble fertilizers can generally ensure high crop yields, but excessive leaching of nutrients, mainly as nitrate, can be a major cause of water pollution. Controlled-release fertilizers improve the nutrient use efficiency and lower the environmental hazard, usually without affecting the production. In this study, an innovative controlled-release coated urea fertilizer was compared to conventional nitrogen (N) fertilizers and a soluble ammonium-based fertilizer containing a nitrification inhibitor, in a round table tomato cultivation. Both the water and N balance were evaluated for each treatment, along with the yield and quality of the production. The experiment was repeated in three different seasons (spring, autumn and summer-autumn) in a glasshouse to prevent the effect of uncontrolled rainfall. The results indicated that N leaching decreased by increasing the percentage of coated urea. The application of at least 50% total N as coated urea strongly reduced N leaching and improved N agronomic efficiency in comparison with traditional fertilizers, ensuring at the same time a similar fruit production. Due to reduced leaching, the total N amount commonly applied by growers could be lowered by 25% without detrimental effects on commercial production.

Tropical jute with coated and uncoated urea

1987 ◽  
Vol 109 (1) ◽  
pp. 187-188
Author(s):  
Apurba Sarkar ◽  
P. C. Mitra ◽  
A. R. Roy ◽  
G. C. Biswas
Keyword(s):  
Growth Response ◽  
Slow Release ◽  
Nitrification Inhibitor ◽  
Residual Effect ◽  
Exchange Capacity ◽  
Corchorus Capsularis ◽  
Coated Urea ◽  
The Tropics ◽  
Urea Granules ◽  
Better Than

Jute (Corchorus capsularis L.) is grown in the tropics. It is next only to cotton in importance as a fibre crop. Adequate supplies of plant nutrients, especially N, are essential for its vegetative growth. Response to applied N varies from region to region. In a light-textured soil with low cation exchange capacity (CEC), part of the applied N is generally lost mostly under rainfall (Engelsted & Russel, 1975) and the rest is manifested in the form of residual effect (McEwen, 1970). Such losses can be reduced by using slow-release N fertilizers or by coating the urea granules by paraffin wax, resin, gum, lac, or with a nitrification inhibitor (Prasad, Raj ale & Lakhdive, 1971). There is little information on the use of these products on jute. Mondal, Dohary & Pal (1977) reported that coated urea is better than uncoated ones. The current programme was designed to give a better picture.

Studies on the nitrification inhibitor, dicyandiamide (DCD), for increasing the efficiency of nitrogen applied to rice

1985 ◽  
Vol 104 (2) ◽  
pp. 425-428 ◽  
Author(s):  
S. Singh ◽  
R. Prasad
Keyword(s):  
Yield Components ◽  
Agricultural Research ◽  
Indian Agricultural Research Institute ◽  
Nitrification Inhibitor ◽  
New Delhi ◽  
Agricultural Research Institute ◽  
Straw Yield ◽  
Yield And Yield Components ◽  
Neem Cake Coated Urea ◽  
Coated Urea

SummaryA field experiment, made during the rainy seasons oof 1982 and 1983 at the Indian Agricultural Research Institute, New Delhi, studied the effects of blending urea with dicyandiamide (DCD) on the yield and yield components of rice. DCD-blended urea was as effective as neem-cake-coated urea in respect of yield components as well as grain and straw yield of rice and when all the nitrogen was applied 10 days after transplanting both the materials produced significantly more grain and straw than prilled urea. Urea super granules (USG) were superior to DCD-blended, as well as neem-coated, urea.

scholarly journals Tillage and Coated-Urea Effects on Nitrous Oxide Emissions from Direct-Seeded, Delayed-Flood Rice Production in Arkansas

2018 ◽  
Vol 1 (1) ◽  
Author(s):  
Rector Casey ◽  
Brye Kristofor R ◽  
Humphreys Joshua ◽  
Norman Richard J ◽  
Slaton Nathan A ◽  
...  
Keyword(s):  
Nitrous Oxide ◽  
Rice Production ◽  
Nitrous Oxide Emissions ◽  
Coated Urea ◽  
Direct Seeded

Greenhouse gas emission reductions in subtropical cereal-based cropping sequences using legumes, DMPP-coated urea and split timings of urea application

Soil Research ◽  
2018 ◽  
Vol 56 (7) ◽  
pp. 724 ◽  
Author(s):  
Graeme D. Schwenke ◽  
Philippa M. Brock ◽  
Bruce M. Haigh ◽  
David F. Herridge
Keyword(s):  
Greenhouse Gas ◽  
Greenhouse Gas Emission ◽  
Nitrification Inhibitor ◽  
Ghg Emissions ◽  
Mitigation Strategies ◽  
Life Cycle Assessments ◽  
Ch4 Emissions ◽  
Ghg Reduction ◽  
Coated Urea ◽  
On Farm

To contribute to national greenhouse gas emissions (GHG) reduction targets, grain growers need strategies that minimise emissions associated with grain production. We used life cycle assessments (LCAs) with field-measured production inputs, grain yields and proteins, legume nitrogen (N2) fixation, and soil nitrous oxide (N2O) and methane (CH4) emissions, to explore mitigation strategies in 3-year crop sequences in subtropical Australia. The sequences were: canola plus 80 kg/ha fertiliser nitrogen (80N)–wheat 85N–barley 65N (CaNWtNBaN), chickpea 0N–wheat 85N–barley 5N (CpWtNBa), chickpea 0N–wheat 5N–chickpea 5N (CpWtCp), and chickpea 0N–sorghum 45N (CpSgN). We also assessed the impacts of split fertiliser N application and urea coated with DMPP, a nitrification inhibitor, on the LCA for the CaNWtNBaN sequence. Total pre-farm plus on-farm GHG emissions varied between 915 CO2-e/ha (CpSgN) and 1890 CO2-e/ha (CaNWtNBaN). Cumulative N2O emitted over the 3-year study varied between 0.479 kg N2O-N/ha (CpWtCp) and 1.400 kg N2O-N/ha (CaNWtNBaN), which constituted 24–44% of total GHG emissions. Fertiliser production accounted for 20% (CpSgN) to 30% (CaNWtNBaN) of total emissions. An extra 4.7 kg CO2-e/ha was emitted for each additional kg N/ha of applied N fertiliser. Three-year CH4 emissions ranged from −1.04 to −0.98 kg CH4-C/ha. Split N and DMPP strategies could reduce total GHG emissions of CaNWtNBaN by 17 and 28% respectively. Results of the study indicate considerable scope for reducing the carbon footprint of subtropical, dryland grains cropping in Australia.

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